CN1934386A - Double shoulder tool joint - Google Patents
Double shoulder tool joint Download PDFInfo
- Publication number
- CN1934386A CN1934386A CNA2005800090878A CN200580009087A CN1934386A CN 1934386 A CN1934386 A CN 1934386A CN A2005800090878 A CNA2005800090878 A CN A2005800090878A CN 200580009087 A CN200580009087 A CN 200580009087A CN 1934386 A CN1934386 A CN 1934386A
- Authority
- CN
- China
- Prior art keywords
- male connector
- negative joint
- axis
- shoulder
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims description 47
- 230000013011 mating Effects 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 17
- 238000009826 distribution Methods 0.000 description 8
- 239000008186 active pharmaceutical agent Substances 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Earth Drilling (AREA)
- Drilling Tools (AREA)
Abstract
The tool joint 1 for drill pipe used for boring oil or gas well. The pin 3 is provided with an outside shoulder 35, a pin base 34 having an outer periphery surface parallel with the pipe axis 50, a male threaded part 33 having a predetermined taper to the pipe axis 50, and a pin nose 32 having an outer periphery surface parallel with the pipe axis 50. The box 2 is provided with a box access sleeve 22 having an inner periphery surface parallel with the pipe axis 50, a female threaded part 23 engaging by thread with the male threaded part 33, a box end sleeve 24 having an inner periphery surface corresponding to the outer periphery surface of the pin nose 32, and an inside shoulder 25. By increasing a total of a mating surface between the outside shoulder 35 and a box access sleeve end portion 21 and a mating surface between the inside shoulder 25 and a pin nose end portion 31, higher torque characteristics is realized without reducing the operativity.
Description
The application is based on the Japanese patent application 2004-106970 that submitted on March 31st, 2004, and the full text that is incorporated herein this Japanese patent application for your guidance.
Technical field
The present invention relates to make hole or the drilling pipe of gas well on the double shoulder tool joint that uses, more specifically, relate to the double shoulder tool joint that is used for drilling pipe, this double shoulder tool joint can be realized higher torque characteristics, and can not reduce operating efficiency.
Background technique
In the prior art, the drilling pipe that is used to bore extended reach well and horizontal well is connected by means of tool-joint.The details of tool-joint provides in standard A PI (American Petroleum Institute) Spec.7.In this standard, the outer diameter of tool-joint forms the outer diameter greater than body, and the inner diameter of tool-joint forms the inner diameter less than body, thus needed high moment of torsion when transmitting drilling well.In addition, the torque characteristics of recommendation tool joint is greater than 80% of the body torque characteristics.
Yet when body was high intensity levels, the situation that provides in this standard usually was difficult to satisfy.Therefore, at traditional tool-joint that is used for drilling pipe, its shortcoming is drilling efficiency owing to the restriction that is subjected to drilling condition reduces, and its shortcoming is that also screw thread is impaired.
In order to address the above problem, a kind of double shoulder tool joint that is used for drilling pipe and has high torque characteristics has been proposed in Japan Patent 3057857 (Fig. 1).
Fig. 1 shows the double shoulder tool joint that is used for drilling pipe in the Japan Patent 3057857.Fig. 2 shows the amplification sectional view of the traditional double shoulder tool joint that is used for drilling pipe.
Tool-joint 101 comprises negative joint end 102 with internal thread part 123 and the male connector end 103 with external thread part 133.
Negative joint end 102 comprises: the negative joint end in contact sleeve (access sleeve) 122 that has predetermined tapering in its end, internal thread part 123 with predetermined tapering identical with negative joint end in contact sleeve 122, negative joint end end sleeve 124 with predetermined tapering identical with internal thread part 123, extend from the end of negative joint end end sleeve 124 and perpendicular to the interior shoulder 125 of tube's axis 150, perimembranous 141 in the pipe of hollow is provided along tube's axis 150, negative joint end peripheral part 126 with the outer surface that forms negative joint end 102.Negative joint end peripheral part 126 is constructed like this: its diameter increases through the distolateral taper shoulder 127 of negative joint from pipe peripheral part 140 gradually along tube's axis 150.
Male connector termination minister's degree 132a forms short, and for example about 10mm is so that interchangeable with the screw thread that meets the API standard.In addition, the male connector end group portion gap 139 that is formed by the interior perimeter surface of the outer surface of male connector end group portion 134 and negative joint end in contact sleeve 122 forms wide 2.1mm～2.5mm, so as with the screw thread that meets the API standard be interchangeable.The male connector termination portion gap 138 that is formed by the interior perimeter surface of the outer surface of male connector termination portion 132 and negative joint end end sleeve 124 forms wide 2.1mm～2.5mm.
Negative joint end 102 and male connector end 103 are provided with inclined-plane 121a and 135a, and these two inclined-planes are formed at the outer surface place of negative joint end in contact sleeve ends 121 places and outer shoulder 135 respectively.Here, the tapering of external thread part 133 and internal thread part 123 is 2/12.
Negative joint end 102 and male connector end 103 according to traditional tool-joint 101 of said structure are connected one to the other to together as described below.At first, negative joint end 102 and male connector end 103 toward each other, and the end of male connector end 103 is inserted in the hole of negative joint end 102.Two or one in negative joint end 102 and the male connector end 103 are rotated and manually clamp, are coupled to negative joint end in contact sleeve ends 121 up to outer shoulder 135.When manually clamping, the gap between interior shoulder 125 and the male connector termination portion end 131 forms wide 0mm～0.5mm.Then, male connector end 103 and negative joint end 102 are clamped with predetermined chuck strength by anchor clamps.
According to traditional tool-joint 101, owing to be formed with outer shoulder 135 and interior shoulder 125, can realize that outer shoulder 135 reaches interior shoulder 125 respectively and the plane contact between the corresponding fitting surface of negative joint end in contact sleeve ends 121 and male connector termination portion end 131.In addition, because the gap between interior shoulder 125 and the male connector termination portion end 131 forms wide 0mm～0.5mm when manually clamping, thus can obtain high moment of torsion, and the tensile stress in external thread part 133 and the internal thread part 123 is minimized.
Summary of the invention
(the problem to be solved in the present invention)
Yet the characteristic of traditional double shoulder tool joint always is not enough to satisfy higher in recent years torque characteristics demand.Promptly, because male connector termination minister's degree 132a is short, when male connector termination portion 132 clamps along with screw thread and during pressurized, the compression deviation of male connector termination portion 132 even under the situation of the little angle of pinching, surpass its limit of elasticity, thus make male connector termination portion 132 local plastic deformation.Thereby, enough angles of pinching can not be provided, make the structure of traditional double shoulder tool joint always not be enough to satisfy the demand of higher torque characteristics.
In recent years, often reach the extended reach well of 10km and creeping into of horizontal well.In traditional double shoulder tool joint, below feature need: 1) higher torque characteristics, with the friction that enlarge markedly of opposing with the hole wall of drilling well, 2) bigger inner diameter, to prevent that the pressure that bores liquid in drilling process from reducing, and 3) outer diameter can be identical with the outer diameter of the peripheral part of body, to improve the reuse efficiency of drilling cuttings.Here, in order to realize high torque characteristics, the fitting surface between male connector end 103 and the negative joint end 102 can increase by increasing outer diameter and reducing inner diameter.
Yet as mentioned above, if inner diameter reduces, the pressure that bores liquid when creeping into reduces and will worsen.In addition, if outer diameter increases, the reuse efficiency of drilling cuttings will descend.Further, if the tapering that reduces external thread part 133 and internal thread part 123 is to increase the cooperation area between male connector end 103 and the negative joint end 102, operating efficiency will descend, because the longer time of screw thread action need of such tool-joint.
Therefore, the purpose of this invention is to provide a kind of double shoulder tool joint, wherein comparing it can provide higher torque characteristics and can not reduce operating efficiency with legacy equipment.
(solution to the problems described above)
To achieve these goals, according to a feature of the present invention, double shoulder tool joint comprises: perimembranous in the pipe that male connector end, this male connector end comprise male connector end peripheral part with predetermined outer diameter, have predetermined inner diameter, have outer shoulder perpendicular to the fitting surface of tube's axis, have the outer surface that is parallel to tube's axis male connector end group portion, have the external thread part of predetermined tapering and have the outer surface that is parallel to tube's axis and with respect to tube's axis perpendicular to the male connector termination portion of the fitting surface of tube's axis; And the negative joint end, this negative joint end comprises the negative joint end peripheral part with predetermined outer diameter, the interior perimembranous of pipe with predetermined inner diameter, have and be suitable for the fitting surface that matches with the fitting surface of outer shoulder and corresponding to the outer surface of male connector end group portion and form the negative joint end in contact sleeve of the interior perimeter surface that is parallel to tube's axis, be threadably engaged the internal thread part of described external thread part, have corresponding to the outer surface of male connector termination portion and form the negative joint end end sleeve of the interior perimeter surface that is parallel to tube's axis, be suitable for matching and form interior shoulder with having perpendicular to the fitting surface of tube's axis with the fitting surface of male connector termination portion.
In the present invention, preferably, when the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of negative joint end peripheral part or male connector end peripheral part is the pipe of 114.3mm～190.5mm and negative joint end or male connector end, the relief width 0.5mm～1.6mm between the interior perimeter surface of the outer surface of male connector termination portion and negative joint end end sleeve.
In the present invention, preferably, when the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of negative joint end peripheral part or male connector end peripheral part is the pipe of 114.3mm～190.5mm and negative joint end or male connector end, the relief width 0.5mm～1.6mm between the interior perimeter surface of the outer surface of male connector end group portion and negative joint end in contact sleeve.
In the present invention, preferably, when the inner diameter of perimembranous was 50.0mm～114.3mm in the outer diameter of negative joint end peripheral part or male connector end peripheral part is the pipe of 114.3mm～190.5mm and negative joint end or male connector end, the length of male connector termination portion was 12.7mm～38.1mm.
According to another characteristic of the invention, double shoulder tool joint comprises: perimembranous in the pipe that male connector end, this male connector end comprise male connector end peripheral part with predetermined outer diameter, have predetermined inner diameter, have outer shoulder perpendicular to the fitting surface of tube's axis, have outer surface male connector end group portion, have the external thread part of predetermined tapering and have tapering with respect to tube's axis less than the outer surface of external thread part tapering and perpendicular to the male connector termination portion of the fitting surface of tube's axis; And the negative joint end, this negative joint end comprises the negative joint end peripheral part with predetermined outer diameter, the interior perimembranous of pipe with predetermined inner diameter, have and be suitable for the fitting surface that matches with the fitting surface of outer shoulder and corresponding to the negative joint end in contact sleeve of the interior perimeter surface of the outer surface of male connector end group portion, be threadably engaged the internal thread part of external thread part, have corresponding to the outer surface of male connector termination portion and form the negative joint end end sleeve of the interior perimeter surface that is parallel to tube's axis, with have the fitting surface that is suitable for male connector termination portion and match and merge the interior shoulder that forms perpendicular to the fitting surface of tube's axis.
(effect of the present invention)
According to double shoulder tool joint of the present invention, the interior perimeter surface of the outer surface of male connector end group portion and negative joint end in contact sleeve forms and is parallel to tube's axis, and the outer surface of the interior perimeter surface of male connector termination portion and negative joint end end sleeve forms and is parallel to tube's axis, make and compare with traditional double shoulder tool joint, fitting surface between the interior shoulder of the fitting surface between the outer shoulder of negative joint end in contact sleeve ends and male connector end and portion end, male connector termination and negative joint end increases, thereby has disperseed to concentrate on the stress on outer shoulder and the interior shoulder.Therefore, the moment of torsion resistant property of tool-joint is improved and drilling efficiency also is improved.Here, the implication of " parallel " comprises the state of almost parallel, i.e. the little situation of tapering.
According to double shoulder tool joint of the present invention, gap between the interior perimeter surface of the outer surface of male connector termination portion and negative joint end end sleeve forms wide 0.5mm～1.6mm, thereby can improve operability and can increase fitting surface between portion end, male connector termination and the interior shoulder.
According to double shoulder tool joint of the present invention, gap between the interior perimeter surface of the outer surface of male connector end group portion and negative joint end in contact sleeve forms wide 0.5mm～1.6mm, thus can improve operability and can increase negative joint end in contact sleeve ends and outer shoulder between fitting surface.
According to double shoulder tool joint of the present invention, when the outer diameter of the peripheral part of negative joint end or male connector end is that the inner diameter of the interior perimembranous of 114.3mm～190.5mm and negative joint end or male connector end is when being 50.0mm～114.3mm, the length of male connector termination portion is 12.7mm～38.1mm, thereby can expectation can increase the limit of elasticity value that is applied to the moment of torsion of male connector termination portion along with advancing of screw thread, and can prolong the working life of equipment.
Description of drawings
Explain according to preferred implementation of the present invention, wherein below in conjunction with accompanying drawing:
Fig. 1 is the sectional view along the axis of traditional double shoulder tool joint;
Fig. 2 is the amplification sectional view of traditional double shoulder tool joint;
Fig. 3 is the integrally-built sketch that the double shoulder tool joint in the preferred embodiment for the present invention is shown;
Fig. 4 is that double shoulder tool joint in the preferred embodiment for the present invention is along the sectional view of the tube's axis among Fig. 3;
Fig. 5 is the amplification sectional view of the double shoulder tool joint in the preferred embodiment for the present invention;
Fig. 6 A is the cross-sectional view along A-A line among Fig. 4, shows the outer shoulder of the double shoulder tool joint in the preferred implementation and the fitting surface between the negative joint end in contact sleeve ends;
Fig. 6 B is the cross-sectional view along A ' among Fig. 1-A ' line, shows the outer shoulder of traditional double shoulder tool joint and the fitting surface between the negative joint end in contact sleeve ends;
Fig. 7 A is the cross-sectional view of B-B line in Fig. 4, shows the interior shoulder of the double shoulder tool joint in the preferred implementation and the fitting surface between the male connector termination portion end;
Fig. 7 B is the cross-sectional view of B '-B ' line in Fig. 1, shows the interior shoulder of traditional double shoulder tool joint and the fitting surface between the male connector termination portion end;
Fig. 8 shows the plotted curve of embodiment's 1,2 and comparative example yield strength in clamping test;
Fig. 9 A shows the sketch that the stress distribution in the major component of the double shoulder tool joint in the preferred embodiment for the present invention provide is provided by Finite Element Method (FEM);
Fig. 9 B shows the sketch that the stress distribution in the major component of the double shoulder tool joint among the comparative example provide is provided by FEM.
Embodiment
(overall structure of tool-joint)
Fig. 3 shows the overall structure of double shoulder tool joint according to the preferred embodiment of the present invention.Double shoulder tool joint 1 is to be used for by the screw section negative joint end 2 and male connector end 3 articulate pipe joint instruments, wherein, negative joint end 2 is formed at an end of drilling pipe 4 and is provided with internal thread part 23, and male connector end 3 is formed at an end of another drilling pipe 4 and is provided with external thread part 33.Drilling pipe 4 is configured to sequentially be connected to another drilling pipe 4 by the tool-joint 1 that comprises negative joint end 2 and male connector end 3.
(structure of tool-joint)
Fig. 4 be according to the preferred embodiment of the present invention double shoulder tool joint along the sectional view of the tube's axis among Fig. 3.
Fig. 5 shows the amplification cross sectional view of the detailed structure of double shoulder tool joint according to the preferred embodiment of the present invention.
Tool-joint 1 comprises negative joint end 2 with internal thread part 23 and the male connector end 33 with external thread part 33.
Negative joint end 2 comprises: have the negative joint end in contact sleeve 22 of the interior perimeter surface that is parallel to tube's axis 50, form and have in abutting connection with negative joint end in contact sleeve 22 2/12 tapering internal thread part 23, have the interior perimeter surface that is parallel to tube's axis 50 negative joint end end sleeve 24, form interior shoulder 25, perimembranous 41 in the pipe of hollow is provided along tube's axis 50 and constitutes the negative joint end peripheral part 26 of the outer surface of negative joint end 2 perpendicular to tube's axis 50.Negative joint end peripheral part 26 so forms: its outer diameter increases through the distolateral taper shoulder 27 of negative joint gradually from pipe peripheral part 40.In Figure 4 and 5, simplified the screw thread of external thread part 33 and internal thread part 23, so that be shown clearly in its tapering.
Preferably, negative joint end in contact sleeve 22 and negative joint end end sleeve 24 can have the interior perimeter surface that is parallel to tube's axis 50 separately, but the present invention is not restricted to this.Negative joint end in contact sleeve 22 and negative joint end end sleeve 24 can have the interior perimeter surface of tapering less than the tapering of internal thread part 23 or external thread part 33.Particularly, the interior perimeter surface of negative joint end in contact sleeve 22 and negative joint end end sleeve 24 preferably is not more than 1/12 with respect to the tapering of tube's axis 50.
In the present invention, the implication of " parallel " comprises the state of almost parallel, i.e. the little situation of tapering.Similarly, the implication of " perpendicular to tube's axis " comprises the state that is approximately perpendicular to tube's axis.
Preferably, male connector termination portion 32 and male connector end group portion 34 can have separately and form the outer surface that is parallel to tube's axis 50, but the present invention is not restricted to this.Male connector termination portion 32 and male connector end group portion 34 can have the outer surface of tapering less than the tapering of internal thread part 23 or external thread part 33.Particularly, the outer surface of male connector termination portion 32 and male connector end group portion 34 preferably is not more than 1/12 with respect to the tapering of tube's axis 50.
Among the present invention, the implication of " parallel " comprises the state of almost parallel, i.e. the little situation of tapering.Similarly, the implication of " perpendicular to tube's axis " comprises the state that is approximately perpendicular to tube's axis.
Among the present invention, the interior perimeter surface of the outer surface of male connector termination portion 32 and negative joint end end sleeve 24 is formed be parallel to tube's axis 50.The simplification of considering manufacturing is with convenient, and the interior perimeter surface of the outer surface of male connector end group portion 34 and negative joint end in contact sleeve 22 can be not parallel to tube's axis 50, and can form and have the tapering similar to legacy equipment.
When the outer diameter of negative joint end or male connector end is the inner diameter of 114.mm～190.5mm and negative joint end or male connector end when being 50mm～114.3mm, the length 32a of male connector termination portion 32 is preferably 11mm～49mm.Consider operation convenience and manufacture difficulty, more preferably, male connector termination minister's degree 32a is 12.7mm～38.1mm.
Material for negative joint end 2 and male connector end 3 has no particular limits, as long as it reaches the sufficient intensity according to the standard of API Spec.7.
(connection of tool-joint)
Tool-joint in the application of the invention preferred implementation and connect drilling pipe and carry out with following.At first, negative joint end 2 and male connector end 3 toward each other, and the end of male connector end 3 is inserted in the hole of negative joint end 2.Negative joint end 2 and male connector end 3 two or wherein any rotation and clamping are fitted to each other up to outer shoulder 35 and negative joint end in contact sleeve ends 21, in addition in shoulder 25 and male connector termination portion end 31 be fitted to each other.
(effect of preferred implementation)
According to preferred implementation of the present invention, the outer surface of the interior perimeter surface of negative joint end in contact sleeve 22 and male connector end group portion 34 forms and is parallel to tube's axis 50, and the outer surface of the interior perimeter surface of negative joint end end sleeve 24 and male connector termination portion 32 forms and is parallel to tube's axis 50, thereby, compare with traditional tool-joint, can increase the thickness of male connector termination portion 32 and negative joint end in contact sleeve 22.Therefore, compare with traditional tool-joint, can increase fitting surface between negative joint end in contact sleeve ends 21 and the outer shoulder 35 and the fitting surface between male connector termination portion end 31 and the interior shoulder 25---in traditional tool-joint the outer surface of the interior perimeter surface of the outer surface of the interior perimeter surface of negative joint end in contact sleeve and male connector end group portion and negative joint end end sleeve and male connector termination portion have with outside or the identical tapering of internal thread part.According to this structure, can improve the moment of torsion resistance, and prolonged the working life of tool-joint.
In addition, by increasing male connector termination minister's degree 32a, compare with the short male connector end (10mm is long) in the traditional tool-joint, can reduce since male connector termination portion along with advancing of screw thread moved the moment of torsion of generation, thereby realization more is threaded.According to this structure, can improve the moment of torsion resistance, and prolonged the working life of tool-joint.
Yet if male connector termination minister's degree 32a is more than or equal to 50m, the rigidity of male connector termination portion 32 is variation, the angle of pinching that needs are bigger, and will increase internal and external threads portion 23 and 33 and the wearing and tearing of interior shoulder 25.Thereby will shorten the working life of equipment.
Fig. 6 A is the cross-sectional view along the A-A line among Fig. 4, show the outer shoulder of the double shoulder tool joint in the preferred embodiment for the present invention and the fitting surface between the negative joint end in contact sleeve ends, and Fig. 6 B is the cross-sectional view of the A '-A ' line in Fig. 1, shows the outer shoulder of traditional double shoulder tool joint and the fitting surface between the negative joint end in contact sleeve ends.
Among Fig. 6 A, the width of the fitting surface that the outer shoulder 35 of " a " expression cooperates with negative joint end in contact sleeve ends 21.
On the other hand, among Fig. 6 B, the width of the fitting surface that the outer shoulder 135 of " b " expression cooperates with negative joint end in contact sleeve ends 121.
High-visible from Fig. 6 A and 6B, formed relativity a＞b, promptly the width a among the present invention is greater than the width b in traditional tool-joint.In other words, extend and be parallel to tube's axis 50 because negative joint end in contact sleeve 22 forms from the negative joint end in contact sleeve side of internal thread part 23, so the width of fitting surface of the present invention is different from the width of the fitting surface of traditional tool-joint---in traditional tool-joint with shoulder 135 outside negative joint end in contact sleeve ends 121 that internal thread part 123 has an identical tapering is coupled to.
Thereby the fitting surface between outer shoulder of the present invention and the negative joint end in contact sleeve ends is greater than the fitting surface of traditional tool-joint.
Fig. 7 A is the cross-sectional view along the B-B line among Fig. 4, show the interior shoulder of the double shoulder tool joint in the preferred embodiment for the present invention and the fitting surface between the male connector termination portion end, and Fig. 7 B is the cross-sectional view along the B ' among Fig. 1-B ' line, shows the interior shoulder of traditional double shoulder tool joint and the fitting surface between the male connector termination portion end.
In Fig. 7 A, the width of the fitting surface that shoulder 25 cooperates with male connector termination portion end 31 in " a ' " expression.
On the other hand, in Fig. 7 B, the width of the fitting surface that shoulder 125 cooperates with male connector termination portion end 131 in " b ' " expression.
High-visible from Fig. 7 A and 7B, form relativity a '＞b ', promptly the width a ' among the present invention is greater than the width b ' in traditional tool-joint.In other words, extend and be parallel to tube's axis 50 because male connector termination portion 32 forms from the male connector termination portion side of external thread part 33, so the width of fitting surface of the present invention is different from the width of the fitting surface in traditional tool-joint---in traditional tool-joint with shoulder 125 in male connector termination portion end 131 that external thread part 133 has an identical tapering is coupled to.
Thereby the fitting surface between interior shoulder of the present invention and the male connector termination portion end is greater than the corresponding fitting surface of traditional tool-joint.
(embodiment 1)
To explain embodiments of the invention 1 below.
In embodiment 1, male connector end and negative joint end are made by the SAE 4137H sill (structural steel with certain hardenability) according to AISI (American Iron and Steel Institute) standard.The representative composition of SAE 4137H sill is by weight at last: C 0.37%, Si 0.2%, Mn1.0%, Cr 1.0% and Mo 0.2%.The intensity of this material is determined according to API Spec.7.Use outer diameter to be male connector end and the negative joint end of 177.8mm inner diameter as 108.0mm.Male connector end and negative joint end are spirally connected mutually and manual the clamping.This craft angle of pinching is defined as being used for the manual clamped position of benchmark.Then, when male connector end and negative joint end clamp with predetermined torque by clamping tool, mark and draw the angle of pinching and moment of torsion to obtain the distortion yield strength.At this moment, it is outstanding from the end of external thread part that male connector termination portion is parallel to pipeline axle ground, and male connector termination portion does not have tapering.Male connector termination minister's degree is 21mm.
Test result is shown in Fig. 8 and the table 1.The distortion surrender that is appreciated that the tool-joint among the embodiment 1 by this result is 108, and 480Nm place begins (angle of pinching is 43 °).
[table 1]
(embodiment 2)
To explain embodiments of the invention 2 below.
Except male connector termination minister's degree is the 11mm, it is identical with embodiment 1 that embodiment 2 is configured to, to obtain the distortion yield strength.
Test result is shown in Fig. 8 and the table 1.The distortion surrender that is appreciated that the tool-joint among the embodiment 2 by this result is 101, and 700Nm place begins (angle of pinching is 29 °).
(comparative example)
Except male connector termination portion tapering be 2/12 and male connector termination minister's degree be the 11mm, the comparative example is configured to identical with embodiment 2 with embodiments of the invention 1, to obtain the distortion yield strength.
Test result is shown in Fig. 8 and the table 1.The distortion surrender that is appreciated that the tool-joint among the comparative example by this result is 82, and 716Nm place begins (angle of pinching is 24 °).
In embodiment 1 and embodiment 2, verified, with comparing among the comparative example, it is about 10% that the summation of the fitting surface between fitting surface between outer shoulder and the negative joint end in contact sleeve ends and interior shoulder and the male connector termination portion end increases, as shown in table 1.
As clear illustrating among Fig. 8 and the table 1, to compare with the distortion yield strength among the comparative example, it is about 31% that the distortion yield strength of the tool-joint among the embodiment 1 increases, thereby confirm to have improved the distortion resistance.Be appreciated that by this result, by increasing the fitting surface between outer shoulder and the negative joint end in contact sleeve ends and the summation of the fitting surface between interior shoulder and the male connector termination portion end, and by increasing male connector termination minister's degree, the tool-joint among the embodiment 1 has higher torque characteristics.
In addition, the distortion yield strength of the tool-joint among the embodiment 1 be body distortion yield strength (123,800Nm) 87.6%.This value is higher than 80% of body distortion yield strength, and this is the recommendation in the API standard.
Here, the tapering of external thread part and internal thread part is 2/12 in embodiment 1, identical with among the comparative example.Thereby the screw thread operability among the embodiment 1 is similar to the screw thread operability among the comparative example.
In addition, as clear illustrating among Fig. 8 and the table 1, compare with the distortion yield strength among the comparative example, it is about 23% that the distortion yield strength of the tool-joint among the embodiment 2 increases, thereby confirm to have improved the distortion resistance.Be appreciated that by this result the tool-joint among the embodiment 2 has higher torque characteristics by increasing the fitting surface between outer shoulder and the negative joint end in contact sleeve ends and the summation of the fitting surface between interior shoulder and the male connector termination portion end.
In addition, the distortion yield strength of the tool-joint among the embodiment 2 be body distortion yield strength (123,800Nm) 82.1%.This value is higher than 80% of body distortion yield strength, and this is the recommendation in the API standard.
Here, the tapering of external thread part and internal thread part is 2/12 among the embodiment 2, identical with among the comparative example.Thereby the screw thread operability among the embodiment 2 is similar to the screw thread operability among the comparative example.
(by FEM analysis confirmation torque characteristics)
Fig. 9 A shows by Finite Element Method (FEM) stress distribution sketch in the major component of the double shoulder tool joint in the preferred embodiment for the present invention provide is provided, and Fig. 9 B shows the sketch that the stress distribution in the major component of the double shoulder tool joint among the comparative example who provides is provided by FEM.Below will be by comparing the difference that the stress distribution among embodiments of the invention 1 and the comparative example is explained in its maximum stress zone (net region), it is at described region generating 91.8kgf/m
2～133kgf/m
2Stress.Here, the yield stress of the yield stress of male connector end 3,103 and negative joint end 2,102 is 91.4kgf/m
2
In Fig. 9 B, show the stress distribution of the male connector end 103 among the comparative example.The diameter that the pressure stress that produces at interior shoulder 125 places and interior shoulder side place on the mating face of the external thread part 133 of male connector end 103 and internal thread part 123 produce reduces stress and interosculates.The cross section of male connector termination portion 132 is illustrated in the stress of the All Ranges generation of male connector termination portion 132 greater than yield stress.In addition, in the zone of the outer shoulder side on the mating face that extends to external thread part 133 and internal thread part 123 from negative joint end in contact sleeve 122 generation greater than the stress of yield stress.
On the other hand, in Fig. 9 A, the male connector termination minister's degree 32 that shows among the embodiment 1 is the stress distribution of the male connector end 3 of 21mm.Even apply with the comparative example in identical moment of torsion, the pressure stress that produces at interior shoulder 25 places that cooperate with male connector termination portion end 31 can not interfere with the diameter that produces at the interior shoulder side place on the mating face of the external thread part 33 of male connector end 3 and internal thread part 23 and reduce stress.The cross section of male connector termination portion 32 is illustrated in can not produce in the All Ranges of male connector termination portion 32 and causes the stress surrendered, and the stress that promptly causes surrendering partly is suppressed.In addition, cause the stress surrendered not produce in the All Ranges of the outer shoulder side on the mating face that extends to external thread part 33 and internal thread part 23 from negative joint end in contact sleeve 22, the stress that promptly causes surrendering partly is suppressed.
Illustrated among Fig. 9 A and the 9B and produced from 82.6gf/m
2～91.8kgf/m
2The zone of stress and generation are from 73.4gf/m
2～82.6kgf/m
2The zone of stress is with for referencial use.On the other hand, from figure, saved the stress distribution that in other zone, produces such as internal thread part 23,123 or external thread part 33,133.
As mentioned above, compare with the comparative example, embodiment 1 tool-joint can be provided with bigger rotation angle, and can apply higher moment of torsion thereon.
Industrial applicibility
Double shoulder tool joint according to the present invention can be used as be used to making hole and the drilling pipe of gas well Tool-joint more specifically, is suitable for being used for boring extended reach well or the horizontal well that extension reaches 10km Drilling pipe in use.
Claims
(according to the modification of the 19th of treaty)
1. double shoulder tool joint comprises:
The male connector end, this male connector end comprises:
Male connector end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Outer shoulder, it has the fitting surface perpendicular to tube's axis;
Male connector end group portion, it has the outer surface that is parallel to described tube's axis;
External thread part, it has predetermined tapering with respect to described tube's axis; With
Male connector termination portion, it has the outer surface that is parallel to described tube's axis on the whole length of described male connector termination portion and perpendicular to the fitting surface of described tube's axis, described outer surface comprises taper; And
The negative joint end, this negative joint end comprises:
Negative joint end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Negative joint end in contact sleeve, it has and is suitable for the fitting surface that matches with the described fitting surface of described outer shoulder, and corresponding with the described outer surface of described male connector end group portion and be parallel to the interior perimeter surface of described tube's axis;
Internal thread part, it is threadably engaged external thread part;
Negative joint end end sleeve, it has corresponding with the described outer surface of described male connector termination portion and is parallel to the interior perimeter surface of described tube's axis; With
Interior shoulder, it has the described fitting surface that is suitable for described male connector termination portion and matches and merge fitting surface perpendicular to described tube's axis.
2. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the described pipe of 114.3mm～190.5mm and described negative joint end or male connector end, the relief width 0.5mm～1.6mm in the described outer surface of described male connector termination portion and described negative joint end end sleeve described between the perimeter surface.
3. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the described pipe of 114.3mm～190.5mm and described negative joint end or male connector end, the relief width 0.5mm～1.6mm in the described outer surface of described male connector end group portion and described negative joint end in contact sleeve described between the perimeter surface.
4. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous was 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the pipe of 114.3mm～190.5mm and described negative joint end or male connector end, the length of described male connector termination portion was 12.7mm～38.1mm.
5. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the described pipe of 114.3mm～190.5mm and described negative joint end or male connector end, relief width 0.5mm～1.6mm between the described interior perimeter surface of the described outer surface of described male connector termination portion and described negative joint end end sleeve, and the length of described male connector termination portion is 12.7mm～38.1mm.
6. double shoulder tool joint as claimed in claim 1, wherein:
Gap in the described outer surface of described male connector termination portion and described negative joint end end sleeve described between the perimeter surface is substantially equal to the gap between the perimeter surface in the described outer surface of described male connector end group portion and described negative joint end in contact sleeve described.
7. double shoulder tool joint comprises:
The male connector end, this male connector end comprises:
Male connector end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Outer shoulder, it has the fitting surface perpendicular to tube's axis;
Male connector end group portion, it has outer surface;
External thread part, it has predetermined tapering with respect to described tube's axis; With
Male connector termination portion is parallel to the outer surface of described tube's axis on the whole length of described male connector termination portion and perpendicular to the fitting surface of described tube's axis, described outer surface comprises taper; And
The negative joint end, this negative joint end comprises:
Negative joint end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Negative joint end in contact sleeve, it has and is suitable for the fitting surface that matches with the described fitting surface of described outer shoulder, and with the described outer surface of described male connector end group portion corresponding in perimeter surface, described in the tapering of perimeter surface less than the tapering of described female thread portion;
Internal thread part, it is threadably engaged external thread part;
Negative joint end end sleeve, it has corresponding with the described outer surface of described male connector termination portion and is parallel to the interior perimeter surface of described tube's axis; With
Interior shoulder, it has the described fitting surface that is suitable for described male connector termination portion and matches and merge fitting surface perpendicular to tube's axis.
Claims (5)
1. double shoulder tool joint comprises:
The male connector end, this male connector end comprises:
Male connector end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Outer shoulder, it has the fitting surface perpendicular to tube's axis;
Male connector end group portion, it has the outer surface that is parallel to described tube's axis;
External thread part, it has predetermined tapering with respect to described tube's axis; With
Male connector termination portion, it has the outer surface that is parallel to described tube's axis and perpendicular to the fitting surface of described tube's axis; And
The negative joint end, this negative joint end comprises:
Negative joint end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Negative joint end in contact sleeve, it has and is suitable for the fitting surface that matches with the described fitting surface of described outer shoulder, and corresponding with the described outer surface of described male connector end group portion and be parallel to the interior perimeter surface of described tube's axis;
Internal thread part, it is threadably engaged external thread part;
Negative joint end end sleeve, it has corresponding with the described outer surface of described male connector termination portion and is parallel to the interior perimeter surface of described tube's axis; With
Interior shoulder, it has the described fitting surface that is suitable for described male connector termination portion and matches and merge fitting surface perpendicular to described tube's axis.
2. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the described pipe of 114.3mm～190.5mm and described negative joint end or male connector end, the relief width 0.5mm～1.6mm in the described outer surface of described male connector termination portion and described negative joint end end sleeve described between the perimeter surface.
3. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous is 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the described pipe of 114.3mm～190.5mm and described negative joint end or male connector end, the relief width 0.5mm～1.6mm in the described outer surface of described male connector end group portion and described negative joint end in contact sleeve described between the perimeter surface.
4. double shoulder tool joint as claimed in claim 1, wherein:
When the inner diameter of perimembranous was 50.0mm～114.3mm in the outer diameter of described negative joint end peripheral part or described male connector end peripheral part is the pipe of 114.3mm～190.5mm and described negative joint end or male connector end, the length of described male connector termination portion was 12.7mm～38.1mm.
5. double shoulder tool joint comprises:
The male connector end, this male connector end comprises:
Male connector end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Outer shoulder, it has the fitting surface perpendicular to tube's axis;
Male connector end group portion, it has outer surface;
External thread part, it has predetermined tapering with respect to described tube's axis; With
Male connector termination portion, it has tapering less than the outer surface of the described tapering of described external thread part and perpendicular to the fitting surface of described tube's axis; And
The negative joint end, this negative joint end comprises:
Negative joint end peripheral part, it has predetermined outer diameter;
Perimembranous in the pipe, it has predetermined inner diameter;
Negative joint end in contact sleeve, its have be suitable for the fitting surface that matches with the described fitting surface of described outer shoulder and with the described outer surface of described male connector end group portion corresponding in perimeter surface;
Internal thread part, it is threadably engaged external thread part;
Negative joint end end sleeve, it has corresponding with the described outer surface of described male connector termination portion and is parallel to the interior perimeter surface of described tube's axis; With
Interior shoulder, it has the described fitting surface that is suitable for described male connector termination portion and matches and merge fitting surface perpendicular to tube's axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004106970 | 2004-03-31 | ||
| JP106970/2004 | 2004-03-31 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010624187.4A Division CN102061893B (en) | 2004-03-31 | 2005-03-30 | Double shoulder tool joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1934386A true CN1934386A (en) | 2007-03-21 |
Family
ID=35063857
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800090878A Pending CN1934386A (en) | 2004-03-31 | 2005-03-30 | Double shoulder tool joint |
| CN201010624187.4A Expired - Fee Related CN102061893B (en) | 2004-03-31 | 2005-03-30 | Double shoulder tool joint |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010624187.4A Expired - Fee Related CN102061893B (en) | 2004-03-31 | 2005-03-30 | Double shoulder tool joint |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP4750708B2 (en) |
| CN (2) | CN1934386A (en) |
| GB (1) | GB2425813B (en) |
| NO (1) | NO334613B1 (en) |
| WO (1) | WO2005095840A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105008785A (en) * | 2013-03-05 | 2015-10-28 | Nkk钢管株式会社 | Double shoulder tool joint |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7210710B2 (en) | 2004-03-01 | 2007-05-01 | Omsco, Inc. | Drill stem connection |
| CA2725126C (en) * | 2005-03-02 | 2012-12-11 | Vallourec Mannesmann Oil & Gas France | Drill stem connection |
| FR2894279B1 (en) * | 2005-12-06 | 2010-08-27 | Francois Kessler | CONNECTING ASSEMBLY FOR DRILL BODY OR HEAVY DRILLING RODS |
| JP5665653B2 (en) * | 2011-05-23 | 2015-02-04 | エヌケーケーシームレス鋼管株式会社 | Double shoulder type tool joint |
| RU2504710C1 (en) * | 2012-12-13 | 2014-01-20 | Общество С Ограниченной Ответственностью "Тмк-Премиум Сервис" | Sealed threaded connection of casing pipes (versions) |
| FR3027338B1 (en) * | 2014-10-16 | 2016-12-02 | Vallourec Oil & Gas France | VERSATILE, DOUBLE-THRUST CONNECTION |
| CN105952391A (en) * | 2016-06-24 | 2016-09-21 | 江阴德玛斯特钻具有限公司 | Improved double-shouldered drill pipe joint |
| AU2017100340B4 (en) * | 2017-03-23 | 2017-09-14 | Bruce William Haines | Refurbishing Drill Rods |
| SG11202101219XA (en) | 2018-12-28 | 2021-03-30 | Halliburton Energy Services Inc | Threaded joint for coupling two concentric tubes to one tube |
| EP3712374B1 (en) * | 2019-03-18 | 2022-09-28 | Sandvik Mining and Construction Tools AB | Drill string rod |
| RU201674U1 (en) * | 2020-07-11 | 2020-12-28 | Общество с ограниченной ответственностью "ТЕХНОМАШ" | THREADED DRILL PIPE CONNECTION |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4548431A (en) * | 1981-12-17 | 1985-10-22 | Hughes Tool Company - Usa | Tool joint with internal/external make-up shoulders |
| CA1182490A (en) * | 1981-12-17 | 1985-02-12 | Hughes Tool Company | Tool joint with internal/external make-up shoulder |
| US4659119A (en) * | 1983-12-29 | 1987-04-21 | Dril-Quip, Inc. | Latching connector |
| GB8617827D0 (en) * | 1986-07-22 | 1986-08-28 | British Steel Corp | Joints for tubular members |
| JPH07260053A (en) * | 1994-03-16 | 1995-10-13 | Nippon Steel Corp | Screw coupling for petroleum drilling pipe excellent in torsion characteristic |
| US6485063B1 (en) * | 1996-05-15 | 2002-11-26 | Huey P. Olivier | Connection |
| US5908212A (en) * | 1997-05-02 | 1999-06-01 | Grant Prideco, Inc. | Ultra high torque double shoulder tool joint |
-
2005
- 2005-03-30 CN CNA2005800090878A patent/CN1934386A/en active Pending
- 2005-03-30 GB GB0617759A patent/GB2425813B/en active Active
- 2005-03-30 CN CN201010624187.4A patent/CN102061893B/en not_active Expired - Fee Related
- 2005-03-30 JP JP2006534490A patent/JP4750708B2/en active Active
- 2005-03-30 WO PCT/JP2005/006714 patent/WO2005095840A1/en active Application Filing
-
2006
- 2006-10-30 NO NO20064958A patent/NO334613B1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105008785A (en) * | 2013-03-05 | 2015-10-28 | Nkk钢管株式会社 | Double shoulder tool joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102061893B (en) | 2013-07-10 |
| GB0617759D0 (en) | 2006-10-18 |
| WO2005095840A1 (en) | 2005-10-13 |
| NO20064958L (en) | 2006-10-30 |
| GB2425813A (en) | 2006-11-08 |
| CN102061893A (en) | 2011-05-18 |
| NO334613B1 (en) | 2014-04-28 |
| JP4750708B2 (en) | 2011-08-17 |
| JP2007530875A (en) | 2007-11-01 |
| GB2425813B (en) | 2008-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1934386A (en) | Double shoulder tool joint | |
| CN1215277C (en) | Fatigue-resistant threaded bevelled tubular element | |
| CN1271309C (en) | Threaded pipe connection | |
| CN1044279C (en) | Thread joint for tube | |
| CN1914449A (en) | Screw joint for oil well pipe, and method of producing the same | |
| CN1187154C (en) | Cutting tool system and means of accurately positioning same | |
| CN1977124A (en) | Screw coupling for oil well pipe | |
| CN1133842C (en) | Oil well pipe screw joint, and threading method and appts. therefor | |
| AU2008260691B2 (en) | Rock-drilling equipment as well as female and male parts therefor | |
| CN1420972A (en) | Expandable joint connector | |
| CN1272521C (en) | Tubular threaded joint with reinforced stop | |
| CN101036017A (en) | Pipe fixing system | |
| CN1693723A (en) | A joining assembly including a plastic support member and a plastic threaded element | |
| CN1605762A (en) | Fastening tool and fastening bolt | |
| US10627023B2 (en) | Threaded coupling end for a percussion drill string component | |
| CN1245585C (en) | Pipe thread joint | |
| US11262005B2 (en) | Superhigh torsional strength, metallic and airtight drillrod coupler | |
| CN1766278A (en) | Tubular goods with threaded integral joint connections | |
| CN208034287U (en) | A kind of fixture for grinding inner holes of impactor inner casing | |
| CN104775758B (en) | A kind of hold angle helicoid hydraulic motor for extended reach directional well | |
| CN211342811U (en) | Well drilling casing with anti-abrasion function | |
| CN1306206C (en) | Holding device for a tool to be supplied with a fuel and tool to be supplied with a fuel | |
| CN207027778U (en) | Wear-resisting solid center bit | |
| CN209838330U (en) | Oil pipe centralizer of drilling and production equipment | |
| CN106437550A (en) | Taper thread |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20070321 |